Search efforts by rescue workers and K-9 units continued in Bangkok at a collapsed construction site on Sunday (March 30) as the critical 72 hour time window to find any survivors encroached.

A mother of a missing construction worker was seen deeply distraught as she watched the search mission at the construction site on Sunday, repeatedly shouted out for her daughter's name.

At least 78 people remained trapped under the debris of the collapsed building, but the conditions of the rubble pile and the unstable structure are hindering rescue efforts.

"The area in which we could work on is very limited due to metal debris and sharp edges. It is also hard for us to try and get inside so we had to try to find (ways inside) from around the edges, or where the dogs can get into", said a police K-9 unit officer at the scene.

A 7.7 magnitude earthquake in Myanmar jolted parts of neighbouring Thailand, bringing down an under-construction skyscraper and killing at least 17 people across the capital, according to Thai authorities.

(Production: Thomas Suen, Napat Wesshasartar, Juarawee Kittisilpa)